Common tests do not distinguish well between red and green deficiencies. This is an experimental test which works for some people with stronger deficiencies.

% of Red Vision
No RED vision means the world looks more blue-green. Red helps the brain create yellow-greens and yellows. Weakness in red usually means the eye has trouble distinguishing greens from yellow-greens

The inner boxes are all pure green. The ten outer squares create yellow by adding red. How well can you distinguish the inner box? Good RED vision means you can see slight differences in YELLOW-GREEN hues.(Look for difference in color, not just brightness)

(For techies, the HTML color code I use is printed at the top)

% of Green Vision
No GREEN vision means the world looks more blue-red orp purplish. Green helps the brain create yellows and oranges from reds. Weakness in green usually means the eye has trouble distinguishing reds, oranges and yellows.

The inner boxes are all pure red. The outer square creates yellow by adding green. How well can you distinguish the inner box? Good GREEN vision means you can see slight differences in RED-ORANGE hues

Disclaimer: These pages are meant to help individuals, parents and teachers possibly identify potential problems. All these tests are experimental tests. The tests are not definitive, nor legally official. Unfortunately, common Ishihara dot tests are not very accurate either, nor do they explain much at all, and more accurate tests are hard to find. See professionals for more official tests. --- S. Holland

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